12/24/2023 0 Comments Bzflag second monit![]() When the Screen Resolution applet makes changes, it gives you 20 seconds to undo the change. However, it won't make any screen changes. If you specify an invalid screen resolution or refresh rate, then xrandr will fail with a cryptic error message. Xrandr -s 1 -r 70 # screen size 1 at 70 Hz Xrandr -s 1024x768 -r 70 # for 70 Hz (default listed is 75 Hz) Xrandr -s 1024x768 # specify by dimensions Using the example, you can set the screen to 1024 × 768 with any of these commands: You can use xrandr to change resolutions by specifying one of the listed sizes. This could damage your monitor and video card! ![]() The xrandr command shows your video driver resolutions and allows you to set a screen resolution that is not supported by your montior. Your video card, video driver, and monitor many not all support the same resolutions. These resolutions are not necessarily the same as the ones listed in /etc/X11/ nf (for X-Windows), and may not be supported by your monitor. In this example, my video driver supports 18 different screen resolutions, and up to 4 different refresh rates. For example, to list the screen resolutions supported by the video driver, you would use:Ģ 800 x 600 ( 342mm x 271mm ) 75 72 60 56ġ6 400 x 300 ( 342mm x 271mm ) 75 72 60 56 The full list of supported screen resolutions can be found with the X-Windows rotate and reflection command: xrandr. The System Preferences Screen Resolution applet does not list all of your available screen resolutions and settings. You can also choose to set new resolution for your login account or make it a system-wide change. From here, you can select the desired resolution and refresh rate. To change the default resolution, use the System Preferences Screen Resolution applet (see Figure 9-1). Thus, this is usually the default resolution. Unless you have a really old CRT monitor, your display probably supports 1024 × 768. If your graphics card supports 1280 × 1024 but your monitor supports only 1024 × 768, then you won't be able to see the display at 1280 × 1024. Unfortunately, ddcprobe does not always know about your monitor, especially if you are using old equipment. During the desktop install, they are used to identify the maximum resolution and to configure the /etc/X11/nf file. These commands identify the video card and monitor. Other drivers include vesa, nvidia, nv, and i810. For example, sudo xre- sprobe ati works for the ATI driver. For example, to list all of the resolution information about my video card and monitor, I can use: The detection is done using the ddcprobe and xresprobe commands. With Ubuntu (and a little tweaking) you can enable two monitors on the same computer, or use a second computer as a second monitor.ĭuring the installation, Ubuntu detects the graphics card and installs a usable driver. Other customizations that are becoming really common are dual-monitors and cross-desktop systems. I've seen some people spend hours selecting and tuning screen savers. With graphics come customizable elements such as screen savers and animated background. Video cards have really come down in price-you can get a decent one that can do 1024 × 768 (or higher resolution!) with true color for under $30. If you start off with 800 × 600 and 256 colors, then you probably have an unsupported video card. Although this is good for getting started, it might not be the best you can do. In most cases, you will end up with at least 1024 × 768 and 24-bit color (16 million colors). During the installation of the graphical desktop, it tries to detect your video card. It is up to the user to upgrade the driver to something other than the default low resolution (for example, 800 × 600 with 256 colors). Some Linux versions install very basic VGA or SVGA graphics support. However, if the display does not work, then you cannot see what you are doing and are completely out of luck. If the keyboard does not work, then you can remotely login. If the mouse doesn't work, you can use the keyboard. When you install the Ubuntu desktop, the video display becomes the single most important system. Hacking Ubuntu (2007) Part III: Improving Performance Chapter 9: Getting Graphical with Video Bling
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